2026-04-17T11:46:59Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1849342025-12-04T21:45:32Zcom_2072_1057col_2072_478917col_2072_478933

00925njm 22002777a 4500 dc Pérez Jiménez, Marina author Campos, Jesús author Jover Modrego, Jesús author Álvarez, Santiago (Álvarez Reverter) author Carmona Guzmán, Ernesto author 2022-04-11T09:48:01Z 2022-04-11T09:48:01Z 2021-12-01 2022-04-11T09:48:01Z LiCH3 and LiCH2CH3 react with the complex [Mo2(H)2(μ-AdDipp2)2(thf)2] (1⋅thf) with coordination of two molecules of LiCH2R (R=H, CH3) and formation of complexes [Mo2{μ-HLi(thf)CH2R}2(AdDipp2)2], 5⋅LiCH3 and 5⋅LiCH2CH3, respectively (AdDipp2=HC(NDipp)2; Dipp=2,6-iPr2C6H3; thf=C4H8O). Due to steric hindrance, only one molecule of LiC6H5 adds to 1⋅thf generating the complex [Mo2(H){μ-HLi(thf)C6H5}(μ-AdDipp2)2], (4⋅LiC6H5). Computational studies disclose the existence of five-center six-electron bonding within the H−Mo≣Mo−C−Li metallacycles, with a mostly covalent H−Mo≣Mo−C group and predominantly ionic Li−C and Li−H interactions. However, the latter bonds exhibit non-negligible covalency, as indicated by X-ray, computational data and the large one-bond 6,7Li,1H and 6,7Li,13C NMR coupling constants found for the three-atom H−Li−C chains. By contrast, the phenyl group in 4⋅LiC6H5 coordinates in an η2 fashion to the lithium atom through the ipso and one of the ortho carbon atoms. Compostos de coordinació Compostos organometàl·lics Compostos de metalls de transició Espectroscòpia de ressonància magnètica nuclear Coordination compounds Organometallic compounds Transition metal compounds Nuclear magnetic resonance spectroscopy Supported -Complexes of LiC Bonds from Coordination of Monomeric Molecules of LiCH3, LiCH2CH3 and LiC6H5 to MoMo Bonds